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Acoustic Amplification AG60 Guitar Amp - Schematic Needed

buck1108

buck1108

New Member
Hi,
I'm troubleshooting my Acoustic AG60 guitar amp and am needing a schematic. Upon contacting the company, they said that they don't supply them, so I'm wonding if the schematic and/or service manual are on the net somewhere? After endless Googling, I came up with nothing.

Thanks very much for any leads!
buck
 
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Hello, If you already searched with zero results, the service manual is not available for downloading.

Check Elektrotanya for similar models, perhaps they share the topology, or start a new thread here explaining your problem, perhaps we can fix it without a schematic.
 
This amplifier is making a loud humming noise and there is no audio signal from the input coming out of the speakers. However, there is a mix of a hum and audio input coming from the headphone jack which is an output from the preamp section. I have replaced the power transistor chip in this with no change in the situation.

I'm continuing to test this, and so I decided to start by testing the transformer.
I disconnected all primary and secondary connections from the board and did a continuity test. There are 3 secondaries on the transformer and each of the three tested with 100% continuity between each of the secondaries' leads. The thing I wonder about is that one of the secondaries also tested continuity with another set of secondaries.
More specifically there is a pair of yellow wires, a pair of orange wires, and three wires consisting of two reds and a green and the middle. The three wires tested continuity with the orange wires.
Could this be in the design, or is this a flaw or damage?

Thanks
 
Sounds like a short at the transformer, but that's not a very usual fail. Check the pcb to see the circuits fed by those secondaries. But your find (Green wires connected to the orange ones) is very suspicious. Almost sure a shorted transformer, but I need more data to confirm that from here. Does the transformer have some label telling the voltages? Some picts could help too.

You can check a transformer connected to a Dim Bulb Tester. A shorted transformer will make the bulb bright.
 
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